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261 Prymno

Orbital diagram
Discovery
Discovered by	C. H. F. Peters
Discovery date	31 October 1886
Designations
MPC designation	(261) Prymno
Pronunciation	/ˈprɪmnoʊ/
Named after	Prymno
Alternative designations	A886 UA
Minor planet category	Main belt
Adjectives	Prymnoian /prɪmˈnoʊ.iən/
Orbital characteristics
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	98.79 yr (36082 d)
Aphelion	2.54054 AU (380.059 Gm)
Perihelion	2.12336 AU (317.650 Gm)
Semi-major axis	2.33195 AU (348.855 Gm)
Eccentricity	0.089449
Orbital period (sidereal)	3.56 yr (1300.7 d)
Average orbital speed	19.51 km/s
Mean anomaly	35.7611°
Mean motion	0° 16 36.386 / day
Inclination	3.63567°
Longitude of ascending node	96.6415°
Argument of perihelion	65.9065°
Physical characteristics
Dimensions	50.93±1.3 km
Synodic rotation period	8.002 h (0.3334 d)
Geometric albedo	0.1141±0.006
Spectral type	B
Absolute magnitude (H)	9.44

261 Prymno is a somewhat large Main belt asteroid. It is classified as a B-type asteroid and probably has a primitive composition not unlike common C-type carbonaceous asteroids.

It was discovered by C. H. F. Peters on October 31, 1886, in Clinton, New York and was named after the Greek Oceanid Prymno.

References

1. "261 Prymno". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 11 May 2016.

• The Asteroid Orbital Elements Database
• Minor Planet Discovery Circumstances
• Asteroid Lightcurve Data File

External links

• Lightcurve plot of 261 Prymno, Palmer Divide Observatory, B. D. Warner (2009)
• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 261 Prymno at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 261 Prymno at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

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• Minor planet object articles (numbered)
• Background asteroids
• Discoveries by Christian Peters
• Named minor planets
• B-type asteroids (Tholen)
• X-type asteroids (SMASS)
• Astronomical objects discovered in 1886
• Main-belt-asteroid stubs